Grinding-mill



J. A; GERWEN. ;G RINDING MILL.

APPLICATION FILED JAN. 22, 1919.

Patented Nov. 16,1920.

S nWd y j a Germ)? J. A. GERWEN.

GRINDING M|LL.. APPLICATION FILED JAN. 22. 1919.

1,359,357. PatentedN0v.16,1920.

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GRINDING MILL.

APPLICATION FILED m4.22. 1919.

1,359,357. PatentedNov. 16,1920.

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APPLICATION FILED 15W. 22, 1919- 1 1,859,357, Patented N0v.'16,1920:

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fnvenfc; \fazz'ua d- (/erwen UNITED STATES PATENT OFFICE.

JULIUS A. GERWEN, 0F MOLINE, ILLINOIS, ASSIGNOR T0 MOLINE MILL MANUFAC-TURING COMPANY, OF MOLINE, ILLINOIS,

A CORPORATION OF DELAWARE.

GRINDING-MILL.

Specification of Letters Patent.

Patented Nov. 16, 1920.

To all whom it may concern.

Be it known that I, JULIUS A. GERWEN, a subject of Germany, and aresident of Moline, in the county of Rock Island and State of Illinois,have invented certain new and useful Improvements in Grinding-Mills, ofwhich the following is a specification.

My invention relates to grinding mills for grinding cereals into flouror coarser products.

My invention involves several features of improved construction,arrangement and operation and particularly improved supporting andbearing structure for the grinding rolls in which smooth, corrugated orotherwise roughened rolls can be interchangeably used and readilywithdrawn or installed without disturbing the grinding adjustment. Thisis a valuable and desirable feature as it enables the quick conversionof a flour mill into a cereal mill for producing coarser products, orthe conversion of a cereal mill into a flour mill, all that isnecessarybeing the removal of one set of rolls and the insertion ofanother, the grinding adjustment being automatically maintained, whicheliminates the necessity of laborious setting and adjusting operationafter interchange of rolls.

A mill unit incorporating the various features of my invention is shownon the accompanying drawing, in which Figure l is a front elevationalView with parts in vertical diametrical section. and others broken awayto more clearly reveal the construction and arrangement,

Fig. 2 is a view of the right end,

Fig. 3 is a view of the left end,

Fig. 4 is a sectional View on plane 44, Fig. 1, and

Fig. 5 is a right end vlew showing the rolls removed.

The machine supporting frame comprises the rectangular lower or basesection 1 and the top or cover section 2 detachably secured thereto. Ashaft 3 extends transversely through the lower part of the top sectionand is journaled in the bearing frames 4: and 5 mounted on and securedto the shelf extensions 6 and 7 on the base part 1. The shaft alsoextends through the hub extensions 8 and 9 on the side walls of the topframe 2 and between these hubs is the feed roll 10 secured to the shaftby set 5 screws 11. Extending transversely between the side walls of thetop frame 2 and diagonally upwardly to the top thereof from the rearside of the feed roll is the wall 12 forming part of a feed funnel whoseupper front wall is formed by the wall 13. A shaft 14 above and parallelwith the shaft 3 is journaled in the side walls of the top frame 2 andhas secured thereto the apron 15 which extends from the lower end of thewall 13 downwardly and terminates infront of the feed roll 10. The grainis charged through the opening 16 in the top of the frame 2 and flowsdown the walls 12 and 13 onto the feed roll which rotates in thedirection indicated by the arrow, and the grain is discharged throughthe gap between the apron 15 and the feed roll, the surface of this rollbeing roughened or corrugated to facilitate discharge of the grains. Toprevent too rapid feeding of the grains the apron 15 is yieldingly heldtoward the feed roll but out of contact with its roughened surface, itbeing yieldingly held with its ends against the hubs 8 and 9 by means ofa weight 17 on the arm 18 extending from the shaft 14. As the feed rolltravels its roughened surface will engage with and facilitate thepassage of the grains past the apron but too rapid discharging will beprevented by the yieldable resistance of the apron. To prevent grainsfrom sticking to the feed roll and being carried around therewith aguard plate 19 encircles the lower part of the roll and is supportedfrom the wall 12 (see Fig. 4).

At its left end the shaft 3 has the gear 20 secured thereto. The bearingframe 4 has the upward extension 21-at its inner end from which extendsthe stub shaft 22 parallel with the shaft 3 and journals on its outerend the hub 23 on which are secured the pulley 24 and the gear pinion25. Between the hub 23 and the frame 21 the arm 26 is mounted on theshaft 22 and at its outer end has the pin 27 on which is mounted thetransmission gear 28. When the arm 26 is down, as shown in full linesFig. 3, the transmission gear will be in mesh with the pinion 25 and thegear 20,'and when the arm is swung upwardly, as shown in dotted linesFig. 3, the transmission gear will be out of mesh.

In the rear wall of the lower frame 1 is the opening 29 whichcommunicates with the side openings 30 and 37, respectively, in the sidewalls of the frame but a closure r 43 and 44, respectively.

side, walls '33 and 34 is provided for closing these openings.Suitablecleats 35 are prov 'vided for locking this closure frame inclosed position. The base frame 1- a t its front has similar openings36, 37 and 38- adapted to be-closed bya frame comprising; the front wall39 and the side walls 40 and 41, the frame being held an place bysuitable cleats 42.

The side walls of the frame 1 at their upper ends have the enlargementsor lugs To the rearof the center line these lugs support the pins and 46on which the semi-circular yoke frames 47 and 48 are pivoted at the endsof their upper legs; These yoke frames are similar and eachliastheopposed set screws 49 and 50 extending through their ends and a setscrew 51 extending radially through the base. These set screws in theframes re spectively support. and aline therein the bearing frames 52and 53 which are pro vided with detachable companion bearing members orcaps 54 and 55, respectively. Asbest shown in Fig.2, the bearin frames52 and 53 have the elongated seating pockets 56 and 57 for the setscrews 49 and '50 so that the bearing" frames can be adjustedhorizontally aswell as :vertically in the yokes. The seating pockets 58the respective bearing frames'for the set screws 51 arelikeWiseenlargedjto permit of the adj usting movements of the bearingframe. To lock the set screws 51 in adjustedfposition lock nuts 59 areshown provided and for locking the set screws 49 and 50 lock screws 60are provided Extending through the bearing frames in the yokes 47 and 48is the shaft 61 to which is secured, the grinding roll 62' which is,within -the' frame 1 and QXi-QIIClS'bG- tweenthe side walls thereof,and the bearing structures in theyokes each supports and confines a ballbearing frame 63 for reducing the friction. Theside walls 33 amt-34 ofthe rear removable housing section are cut away to leave thesemi-circular spaces which register with sifnilarspaces 65 in the 1 tionby tively, which sidewalls of the frame'l to form openings throughwhichthe ends of the shaft 61 pro ject when the ,yokes are down to supportthe grinding roll in operative position. The yokes are locked inclosedorv operative posimeans "of screws 66 and 67, respecpass through thelower ends of the yokes and thread intothe openings 68 and 69 inthesidewalls of the frame 1.

Extending throu h the body. part 1 and journ'aled in'the side wallenlargements 43 and '44 thereof is the shaft 70 which; at :itsvouterends hastheextensions or pins 71 and 7 2 which areeccentric withreference to the shaft axis... O'nZ these eccentric pins arepivotedftheyoke framesl't3 andf74, respectively,

whose construction is similar to that of" the recess? yokes 47 and 48,each yoke having the set screws 75,7 6 and 7? for adjustably supportingthe bearing frame 78 provided with a cap 79, a roller bearing 80being within each bearing structure. Journaled in these bearings are theshaft ends 81 and 82 which support the, front grinding roll 83. Toadjust for the ro er contact or 'a between the t:

grinding rolls" 83' and 62 when the .yoke frames are down, screwabutment rods 84 and 85 are threaded through the lower'ends ofthe yokes7 3 and 74 to abut against the lugs 86 and 87 on the frame 1, theabutment rods being provided each with a hand wheel 88 to facilitateturning thereof, and with a lock nut 89 to lock them in adjustedposition. To yieldingly lock the yokes in adjusted position and toyieldingly hold the rolls toward each other during grinding,

the rods 90 and 91 extend rearwardly from the lower ends of the yokes 73 and 74 and through the lugs 86 and 87, the rear ends of the rods beingprovided each with an abutment head'92 and washer 93 between whichwasher andthe respective lug the compression spring 94 encircles therod; At its front end each rod threads through a nut 95 held againstturning in the pocket 96 in the respective yoke frame. This threadedengagement enables the force of the springs era) be adjusted. Thesprings 94 pulling on the yoke frames 73 and 74 tend to hold the rollsin their proper grinding position but will yield to permit separation ofthe rolls so as to prevent injury thereto. The abutment rods 84 and 85determine the gap between the rolls or the degree of pressure exertedagainst the rolls by the springs 94.

The rollsare driven at differential speed, the shaft 61 of the rear rollhaving the gear 97 thereon and the shaft end '81 forthe front rollhaving the larger gear 98 thereon, the shaft 61 of the rear roll beingdrivenin any desired manner. As shown, it has secured thereto a couplingmember 99by means of which it maybe coupled to the corresponding shaftof an adjacent mill unit. To protect .the gears 97 and 98 upper andlower housing sections 100 and 101 are provided,

the lowerhousing section being supported on and secured to a standard102. The up- .per'section 100 of the housing is removable is .a lever105Yby means of which the shaft may be rotated. Such rotation of theshaft will cause the eccentric pins to gradually swing the yoke framesso that very fine and accurate adjustment can be made of the grindingrolls during running thereof, and when the shaft is turnedsuflicientlythe yoke frames may be swung a sufficient distance to causeunmeshing of the gears 97 and 98 so that the rotation of the front roll83 is stopped. The lever 105 carries a bar 106 pivoted on the ears 107and having at its inner end a latch pin 108, a spring 109 interposedbetween the outer end of the plate and lever tending to extend the pin108 through the opening 110 in the inter. Secured to the side of thehousing frame 1 is the segment 111 having a series of holes 112 forreceiving the pin and for locking the lever 105 in various positions ofadjustment. By pressing against the outer end of the plate 106 the pinis readily withdrawn to permit swing of the lever.

Provision is also made to stop feeding of grain when the grinding rollsare separated and their gears unmeshed. As best shown in Fig. 3, a lever113 extends fromthe arm 26 which carries the transmission gear 28 and achain or cord lla'connects the outer end of this lever with theperiphery of the collar 115 secured to the adjacent end of the shaft 70.The chain is sufficiently slack so that it will be made taut only whenthe lever 105 approaches its uppermost position and the grinding rollsare separated too far for grinding. As the chain tightens the arm 26rotates and unmeshes-the gear 28 from the pinion 25 and gear 20 so thatthe feed roll 10 stops rotating. After the lever 105 is lowered adistance the chain will be slackened suficiently to permit thetransmission gear to drop back into mesh to reconnect the feed roll forrotation.

"With my improved construction and arrangement the grinding rolls can beaccurately located in their supports and adjusted for grindingcooperation. By means of the lever 105 and the eccentric connection ofthe yoke frames for the front roll accurate final adjustment can be madeduring running of the rolls, or the rolls quickly disconnected fromgrindin cooperation. Rolls can be quickly removed and other rollssubstituted. If it is desired to remove a set of rolls the upper gearhousing 100 for the gears 97 and 98 is first-removed, then the rods 90and 91 are unscrewed and the screws 66 and 67 removed. The yoke framesof the two rolls are then free to be swung upwardly into positionindicated in Fig. 5. The bearing frames within the yokes are then openedand the rolls can be withdrawn, and a new set of rolls of differentsurface for different grinding conditions may be inserted. The rollsvention.

being all of the same diameter, it will be frames within the yokes, andthe yokes are merely swung down and fastened and the lever 105 thenoperated for a final adjustment, if necessary.

I do not, of course, desire'to be limited to the exact construction,arrangement and operation shown and described, as changes andmodifications are no doubt possible which would still come within thescope of my in- I claim as follows: v

1. In a grinding machine, the combination of a supporting frame, a.bearing yoke, a journal bearing mounted in said yoke, a grinding rolljournaled in said bearing, a rotative shaft mounted in said frame, andhaving an eccentric bearing on which one end of said yoke is journaled,an abutment screw extending through the other end of said yoke, andabutting against said frame, and a yieldable member connecting saidframe with the end of said yoke adjacent said abutment screw.

2. In a grinding machine, the combination of a housing, supportingframes at the ends of said housing, yoke members, journal bearingsadjustably mounted in said yoke members, a grinding roll journaled atits ends in said journal bearings, a shaft journaled in said frame andprovided with eccentric bearings, said yokes being journaled at one oftheir ends on. said eccentric bearings, an adjustableabutment screw atthe opposite ends of said yokes, and abutting against said frames, rodsconnecting said frames with the last mentioned ends of said yokemembers, and springs interposed be-- tweensaid frames and rods.

3. In a grinding mill, the combination of a supporting housing, agrinding roll within said housing and journaled thereon, a companiongrinding roll within the housing having shaft ends, bearing structuresreceiving said shaft ends, abutments on said housing, adjustableabutment screws at one end of said bearing structures for engaging saidabutments to adjust the gap between the rolls, springs tending to holdsaid screws against'said abutments, a shaft, eccentric pins on saidshaft receiving the upper ends of said bearing structures, and a leverfor turnin said shaft whereby to further adiust the gap between therolls;

In witness whereof, I hereunto subscribe my name this 14th day ofJanuary, A. D.,

JULIUS A. GERWEN.

